Saturated Hydraulic Conductivity in Soils Under Typical Forests in Simian Mountains of Chongqing City
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Abstract:
On the soil profiles under typical planted and natural secondary forests in Simian Mountains of Chongqing City,soil saturated hydraulic conductivity(Ks) was measured by the constant-hydraulic head method,and the correlations between Ks and soil physical features and organic matter contents were established using multivariate regression and path analysis. The results show that,the values of Ks decreased negatively exponentially with increasing soil depths. Comparing to the control,Ks was significantly improved in all the forests,with effects in a descending order as: natural secondary Conifer × Broadleaf forest land > natural secondary Broadleaf forest,Phyllostachys pubescens forest,Conifer forest land > Broadleaf plantation,Conifer × Broadleaf plantation,Conifer plantation land > wasteland. Soil clay content,bulk density,non-capillary porosity and >0. 25 mm aggregate content were the key factors affecting Ks. The Forests encouraged effectively the accumulation of organic matters in the soils. The relationship between Ks and organic matter was well described with quadratic equations. Mixed mode of Conifer × Broadleaf with multiple layers is recommended in forest plantation and management.